Treatment of a roller surface



July 27, 1937. A. FREEDLANDER 2,088,472

TREATMENT OF A ROLLER SURFACE Filed Sept. 30, 1936 x INVENTOR ABRAHAM L. FREEDLANDER BY 2:; .MQ MYJZQ A TTORNE YS I Patented July 27, 1937 UNITED STATES TREATMENT OF A ROLLER SURFACE Abraham L. Freedlander, Dayton,-hio, assignor to The Dayton Rubber Manufacturing Com pany, Dayton, Ohio, a corporation of Ohio Application septemlier30, 1936, Serial No. 103,416"

10 Claims. (Cl. ill-6 7.8)

My invention relates to printing rollers and a method of preparing the surface thereof in order to provide a satisfactory printing surface togive an initial tack to the roller.

It is my object to provide a printing roller that is resistant to the penetration of inks, particularly highly volatile, quick drying inks.

It is an object .to impregnate the surface of a material such as synthetic rubber of the charl0 acter of Duprene with China-wood oil, glycerine or like materials so as to improve the printing surface of the roller without changing the rollerscharacteristics as to hardness, resiliency and the like. The purpose of this. impregnation is to 15 give the roller surface an initial tack which it normally does not have.

to increase the resistance to the penetration of inks, particularly highly volatile, quick drying 2 At the present time, when highly volatile, quick drying inks are used, the solvent in the inks .is absorbed into the surface of the roller so rapidly that the ink is left only as a dry powder as the solvent is absorbed by ,the roller. To prevent this, the present invention; by the impregnation of the surface-ofthe rollerwith China-wood oil, glycerine and the like, permits of the use of these i highly volatile, quick drying inks without the absorption of the solvent in theinks. 3 It will be understood, in the practice of this invention, that any material rubber-like in char- 3 acter, such as a reaction product of divinyl The fundamental feature of the invention is the employment of a rubber-like resilient, flexible roller, which is either entirely or'the covering of 40 which is inert to oils, greases, acids, alkalis and cleaning materials ordinarily used for cleaning the surface of printing surfaces to remove inks therefrom. j I .1

The further principle of the invention is to im- .45 pregnate such a surfacewith China-wood oil,

4 cottonseed oil, linseed oil, glycerine, oiticica oil, f

perilla oil, or any other-of the oils that have body upon drying and that are relatively inert to printing materials and. that have acapacity of 50 flowing until dried.

Referring to the drawingz- Figure 1 is a diagrammatic illustr/tion of the application of a thin film of treating. il by mechanical pressure of apressure roller to press.

55 the oil-into the surface of the printing roller.

The further purpose is Figure 2 is a similar view'showing a pool of oil being maintained adjacent the surface of the roller for deep impregnation.

Figure "3 is a similar view showing a pair of rollers adapted to flex and stretch the surface 5 of the rollers adjacent to the application of the fluid such as an oil and with the additional feature of applying the oil under pressure to accel-.

erate impregnation.

Referring to the drawing in detail, I designates an axle supporting a resilient roller 2 which is preferably formed of rubber and that has a sleeve or covering 3 of Duprene or any other material that is inert to oils, greases and ink cleaning materials. 4 designates a pressure roller which presses the drops of treating oil, such asChinawood oil and the like, at 5 onto the surface of the roller. Any desired means of applying these drops or a spray may be employed, as by the nozzle 6 from the reservoir 1.

In Figure 2 a pool of treating oil 8 is maintained adjacent the surface of the roller'3 by the rollers 4 and 9. This arrangement provides for a heavier impregnation of the roller surface.

It will be understood that the printing roller itself may be'made entirely of a material suchas "Duprene or may merely have a sleeve covering therefor.

Referring to Figure 3, the roller surface 3 is stretched by being depressed at Ill by the rollers I I so that the roller surface is extruded at l2 tocause the surface to be stretched, and adjacent this stretched area is a pool of treating liquid 8 K in the container 13. 'lhigfacilitates the impreg nation of the surface of the roller. If desired, the

liquid 8 may be put under pressure by using th cover I! and air pressure pipe l5.

There are a great variety of ways by which the roller surface may be impregnated.

Prior to the treatment of the'surf'ace of; the 40 roller with the oil, the roller may be subjected to r a vulcanizingstep.

I have discoveredthat Duprene has the property of absorbing oils without *afiecting its desirability as a printing roller but with the result that it is given an initial tack which it normally does not have and therefore makes it immediately useful as a printing roller.

This impregnation also"acts as a resistant to the penetration of-inks, particularly the highly volatile, quick drying inks as heretofore described.

It will be understood that I desire to comprehend within my invention such modifications as come within the scope of my claims and my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is: Y

1. A new article of manufacture for use as a printing roller comprising a roller having a surface of synthetic rubber; and a filler incorporated in the surface thereof of China-wood oil to provide an initial tack to said surface.

2. A new articlev of manufacture comprising a roller having a resilient body, and a resilient inert oil resisting cover of synthetic rubber having non-tacky qualities, said oil resisting cover having its surface treated with oil.

3. A new article of manufacture comprising a roller having a resilient body, and an oil resisting cover of synthetic rubber, said oil resisting cover having it surface treated with oil, such as Chinawood oil.

4. A new article of manufacture for use as a printing roller comprising an axle, a relatively soft resilient body of rubber, and a resilient coating .of synthetic resin, the surface of which is treated with oil.

5. In a method of manufacturing a printing roller, providing a resilient roller with an inert oil, grease and ink-cleaning material resistant coating of synthetic rubber, vulcanizing the roller, and treating the surface of said coating with an oil.

g 6. In a method of treating the surface'of a printing roller having a synthetic rubber surface, rotating the roller, applying oil to the surface of the roller, and rolling the oil into the surface of the roller.

7. In a method of treating the surface of a printing roller having a synthetic rubber surface, rotating the roller, applying oil to the surface of the roller, rolling the oil into the. surface of the roller, and during therolling operation, deflecting the surface of the roller to stretch it.

8. In a process of treating the surface of a synthetic rubber roller with oil, maintaining a pool of oil adjacent the surface thereof, working into the surface of the roller said oil as the roller rotates, and rotating the roller for that purpose.

9. In a process of treating the surface of a.

synthetic rubber roller with oil, maintaining a pool of oil adjacentthe surface thereof, working into the surface of the roller said oil as the roller rotates, rotating the roller for that purpose, and applying pressure to the oil as it is applied to the surface of the roller.

10; In a process of treating the surface of a printing synthetic rubber roller with oil, rotating the roller, simultaneously continuously extruding a portion of the surface of the roller to stretch it, and applying the impregnating oil to the stretched surface of the roller so that the surface of the roller-will be successively impregnated as the successive areas of the surface are stretched.

ABRAHAM L. FREEDLAN DER. 

